Textile substrate made of reinforcement fibers

Abstract

A textile substrate made from reinforcing fibers for the production of composite-material preforms, Including an unidirectional composite consisting of at least one flat layer of multifilament reinforcing yarns arranged alongside and parallel to one another and joined by transverse threads, whereby a nonwoven of thermoplastic polymer material is arranged on the at least one flat layer of multifilament reinforcing yarns and is adhesively bonded to the flat layer of multifilament reinforcing yarns. The textile substrate wherein the transverse threads have a core/sheath structure with a first component forming the sheath and a second component forming the core, wherein the first component has a lower melting point than the second component, the first component is a fusible thermoplastic polymer material and the multifilament reinforcing yarns arranged alongside one another are joined together via the first component of the transverse threads by meltbonding.

The invention claimed is: 
     
       1. Textile substrate made from reinforcing fibers for the production of composite-material preforms comprising a unidirectional composite including at least one flat layer of multifilament reinforcing yarns arranged alongside and parallel to one another,
 wherein
 the multifilament reinforcing yarns arranged alongside one another are joined together by transverse threads, 
 a nonwoven of thermoplastic polymer material is arranged on the at least one flat layer of multifilament reinforcing yarns and is adhesively bonded to the flat layer of the multifilament reinforcing yarns, and 
 the transverse threads have a core/sheath structure with a first component forming the sheath and a second component forming the core, wherein the first component has a lower melting point than the second component, the first component is a fusible thermoplastic polymer material, and the multifilament reinforcing yarns arranged alongside one another are joined together via the first component of the transverse threads by meltbonding; wherein the transverse threads have a linear density in the range of 20 to 50 dtex and the number of transverse threads in the longitudinal direction of the multifilament reinforcing yarns lies in the range of 0.6 to 2 threads/cm. 
 
 
     
     
       2. Textile substrate according to  claim 1 , wherein the first component of the transverse threads has a melting point in the range of 70 to 150° C. 
     
     
       3. Textile substrate according to  claim 2 , wherein the first component of the transverse threads is a polyamide homopolymer or polyamide copolymer or a blend of polyamide homopolymers and/or polyamide copolymers. 
     
     
       4. Textile substrate according to  claim 1 , wherein the second component of the transverse threads has a melting point above 200° C. 
     
     
       5. Textile substrate according to  claim 4 , wherein the core of the transverse threads consists of a polyester. 
     
     
       6. Textile substrate according to  claim 1 , wherein the nonwoven has a mass per unit area in the range of 5 to 25 g/m. 
     
     
       7. Textile substrate according to  claim 1 , wherein the thermoplastic polymer material of nonwoven comprises two polymer components, where a second polymer component of the nonwoven has a lower melting point than a first polymer component of the nonwoven, wherein
 the first polymer component of the nonwoven has a melting point that lies below the melting or decomposition point of the second component of the transverse threads. 
 
     
     
       8. Textile substrate according to  claim 7 , wherein the first polymer component of the nonwoven has a melting point in the range of 180 to 250° C. and the second polymer component of the nonwoven has a melting point in the range of 80 to 140° C. 
     
     
       9. Textile substrate according to  claim 7 , wherein the first polymer component of the nonwoven is a polyamide homopolymer or polyamide copolymer or a blend of polyamide homopolymers and/or polyamide copolymers. 
     
     
       10. Textile substrate according to  claim 1 , wherein on at least one of the surfaces of the flat layer of the multifilament reinforcing yarns, the textile substrate further comprises:
 a binder material whose main component is a thermoplastic polymer or a bisphenol A-based epoxy resin that is solid at room temperature, and which is applied discontinuously to the flat layer of the multifilament reinforcing yarns and is adhesively bonded to the multifilament reinforcing yarns. 
 
     
     
       11. Textile substrate according to  claim 10 , wherein the binder material has a melting point in the range of 80 to 120° C. 
     
     
       12. Textile substrate according to  claim 1 , wherein the multifilament reinforcement yarns are carbon fiber, glass fiber, aramid yarns, or UHMW polyethylene yarns. 
     
     
       13. Textile substrate according to  claim 1 , wherein the at least one flat layer of multifilament reinforcing yarns arranged alongside and parallel to one another has a curved contour in which the multifilament reinforcing yarns are arranged parallel to a circumferential direction of the curved contour, each multifilament reinforcing yarn follows its own trajectory along the circumferential direction of the curved contour, and the trajectories of the multifilament reinforcing yarns have a common center of curvature. 
     
     
       14. Fiber preform for the production of composite-material parts, wherein it comprises a textile substrate according to  claim 1 . 
     
     
       15. Textile substrate made from reinforcing fibers for the production of composite-material preforms comprising a unidirectional composite including at least one flat layer of multifilament reinforcing yarns arranged alongside and parallel to one another,
 wherein 
 the multifilament reinforcing yarns arranged alongside one another are joined together by transverse threads, 
 a nonwoven of thermoplastic polymer material is arranged on the at least one flat layer of multifilament reinforcing yarns and is adhesively bonded to the flat layer of the multifilament reinforcing yarns, and 
 the transverse threads have a core/sheath structure with a first component forming the sheath and a second component forming the core, wherein the first component has a lower melting point than the second component, the first component is a fusible thermoplastic polymer material, and the multifilament reinforcing yarns arranged alongside one another are joined together via the first component of the transverse threads by meltbonding; wherein the transverse threads have a linear density in the range of about 20 to about 50 dtex and the number of transverse threads in the longitudinal direction of the multifilament reinforcing yarns lies in the range of 0.6 to 2 threads/cm. 
 
     
     
       16. The textile substrate according to  claim 15 , wherein the first component of the transverse threads has a melting point in the range of 70 to 150° C. 
     
     
       17. The textile substrate according to  claim 16 , wherein the first component of the transverse threads is a polyamide homopolymer or polyamide copolymer. 
     
     
       18. Textile substrate according to  claim 15 , wherein the second component of the transverse threads has a melting point above 200° C. 
     
     
       19. The textile substrate according to  claim 18 , wherein the second component of the transverse threads consists of a polyester.